RS7 Series Instruction Manual - Benshaw

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1 8. Check the time required for the motor to stop. If the motor stops too quickly, the “BRK TORQUE” potentiometer can be turned CCW for the desired stopping time (this will vary for each application and will have to be adjusted accordingly). DO NOT, in any case, exceed the maximum recommended braking current. (Reference No. 16., above.> 1 9. The “BRK TIMER potentiometer should be adjusted so that the “BRK ON” LED goes out just after the motor stops. Repeat the process. starting/stopping the unit until the “BRK ON” LED goes out just after the motor stops turning; adjusting potentiometer, “BRK TIME,” CCW for a shorter brake time, and CW for a longer brake time. WARNING! Equipment is at line voltage when AC power is connected. Pressing “STOP” pushbutton does not remove AC mains potentiaL All phases must be disconnected before it is safe to touch motor terminals or control equipment parts. REMOVE AC POWER USING POWER FACTOR CAPACITORS Power factor correction capacitors can be used in conjunction with the RS7 Starter; however, the capacitors must be added ahead of the starter and never between starter and motor. If the capacitors are installed between the motor and the starter, serious damage to the starter and/or the motor may result. INDUCTION MOTOR TEMPERATURE MEASUREMENT The motor’s stator winding temperature rise can be determined by recording the winding resistance at room temperature before operation and after the motor has reached running temperature at full load. Using a digital ohmmeter capable of reading milliohms, calculate the stator winding temperature rise by using the following formula: Temperature Rise: T=(RF/R>-1) (234.5 + t) (Degrees C) RF=Resistance in ohms of final temperature measurement R=Resistance at beginning of test t=Room temperature at beginning of test MODIFICATION FEATURES The RS7 Starter may be ordered with the BIPCRS6AK firing card and the BIPCDCIB1 modification card configured for the following modifications: PCRS6AKFTrjnGr AUXILIARY Nb, N/C (FORM C) CONTACTS With this modification, the Form C contacts are supplied to pick up either at the beginning of the start sequence or at the end of the voltage ramp, Contacts will drop out when the RS7 Starter is deenergized. (Reference Drawing Nos, RS7-5 thru 125 and RS7.126 thru 1000.> EXTERNAL POTENTIOMETER VOLTAGE CONTROL This modification supplies provisions to vary output voitae by an external potentiometer. (Reference Drawing Nos. RS75 thru 125 and RS7•.126 thru 1000.) 4
“BJPCDCIB1 Modification Card INTERNAL 24VDC (DRY CONTACT) or EXTERNAL 12OVAC CONTROL POWER “Start/Stop with Auxiliary Contacts “Hand-Off-Auto “Start/Stop with Hand-Off-Auto “Jog at Set Speed “Jog at Set Speed with Start/Stop “Variable Voltage The jog at set speed or vanable voltage options can be operated in two modes. The first mode allows the starter to apply output voltage instantly up to the selected jog speed or variable setting on the potentiometer. This is accomplished by adjusting potentiometer, “STARTING TORQUE,” fully clockwise (CW) and potentiometer, “RAMP” fully counterclockwise (CCW). Both potentiometers are located on the BIPCRS6AK firing card. Install Links 1 and 3, remove Links 4,7,8, and 9 located on the BIPCDCIB1 card. A second set of form C jog auxiliary contacts are available, on terminals sixteen (16), seventeen (17),and eighteen (18) when in this mode of operation, The second mode allows the starter to apply initial output voltage based on a voltage ramp up to the selected jog speed or variable voltage setting on the potentiometer. This is accomplished by adjusting potentiometers, “STARTING TORQUE” and “RAMP”, as per the startup procedures in the RS Series Starter Instruction Manual for normal starting. Install Links 3,7,8, and 9 and remove Links 1 and 4 located on the BIPCDCIB1 card. The second set of form C contacts are not available in this mode of operation. During the initial setup for the desired mode of operation, the potentiometer, “JOG SPEED,” on the BIPCDCIB1 option card should be adjusted fully CCW. If the variable voltage method is being used, the variable voltage potentiometer should be adjusted fully CCW. After the initial setup, the jog speed is set by giving the starter a jog command and adjusting the “JOG SPEED” potentiometer CW until the desired voltage output is reached. Variable voltage is obtained by giving the starter a run command and using an external potentiometer to vary the voltage desired. The second pair of form C run auxiliary contacts are available by installing Link 4 and removing Links 1 ,3,7,8, and 9 on the BIPCDCIB1 card. (Relay K5 must be present on the BIPCDCIB1 card) Other modifications are available using additional printed circuit cards. Benshaw’s Supplemental Instruction manuals document the additional modification features. *nshaws RS7 Supplemental Instruction manual documents the BIPCDCIB1 modifications. PREVENTATIVE MAINTENANCE The components of the RS7 Starter will not deteriorate with use; however, some routine inspection and maintenance is suggested. Periodically disconnect starter input power and vacuum or blow off accumulated debris on Ihe nternai parts with a high-velocity, owpressure blower. Power connectmns on newly installed starters may relax and loosen after two or three weeks of operation. Turn power off and retighten, Check annually thereafter; more often if vibration is present. Loose power connections can cause voltage spikes, overheating, malfunctioning, or failure.
Page 1 and 2: BENSHAW RS7 Series INSTRUCTION MANU
Page 3 and 4: GENERAL Benshaw RS7 Series Solid St
Page 5: 8. On the BIPCRS6AK firing card, tu
Page 9 and 10: SPARE PARTS PART NUMBER DESCRIPTION
Page 11: A, _ J,7 1 RS7—126 TI-IRU 1000 CH

RS7 Series Instruction Manual - Benshaw

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